Yes, shirker is a Scrabble word!
...and is worth 14 points in Scrabble, and 13 points in Words with Friends
shirker
Noun
1. A person who shirks his work or duty (especially one who tries to evade military service in wartime)
What Scrabble words can I make with the letters in shirker?
6 Letter Words
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3 Letter Words
2 Letter Words